D.8
SEL-587Z Instruction Manual
Date Code 20020903
Modbus RTU Communications Protocol
Modbus Commands
The relay responses to errors in the query are shown below:
06h Preset
Single Register
Command
The SEL-587Z uses this function to allow a Modbus master to write directly to
a database register. These registers are used to write the command code and
parameters for the command region, selecting the event number or channel
number for Event data region and setting the Relay Date and Time. If you are
accustomed to 4X references with this function code, for six-digit addressing,
add 400001 to the standard database addresses.
Table D.9
SEL-587Z Command Coils
Coil
Field
1
OUT1
2
OUT2
3
OUT3
4
OUT4
5
ALARM
6
RB1
7
RB2
8
RB3
9
RB4
10
RB5
11
RB6
12
RB7
13
RB8
14
Pulse RB1
15
Pulse RB2
16
Pulse RB3
17
Pulse RB4
18
Pulse RB5
19
Pulse RB6
20
Pulse RB7
21
Pulse RB8
Error
Error Code Returned
Communication
Counter Increments
Invalid bit (coil) number
Illegal Data Address (02h)
Invalid Address
Illegal bit
state requested
Illegal Data Value (03h)
Illegal Function Code/Op Code
Format error
Illegal Data Value (03h)
Bad Packet Format
Summary of Contents for SEL-587Z
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